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** Copyright (c) 1993-2001 by Hans-Ulrich Kiel & Joerg Czeranski
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** All rights reserved.
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the authors may not be used to endorse or promote
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** products derived from this software without specific prior written
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** 4. The name ``iMaze'' may not be used for products derived from this
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** software unless a prefix or a suffix is added to the name.
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** THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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** DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
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** INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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** STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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** IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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** POSSIBILITY OF SUCH DAMAGE.
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** Datei: voxware_audio.c
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** Plays sounds via Voxware kernel driver
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#include <sys/ioctl.h>
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#include <linux/soundcard.h>
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#include <machine/soundcard.h>
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#include "ereignisse.h"
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static char sccsid[] = "@(#)voxware_audio.c 3.18 12/09/01";
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struct arg_option audio_hw_opts[] =
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#define DEV_AUDIO "/dev/dsp"
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/* Daten pro Sekunde */
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#define SAMPLING_RATE 8000
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#define LOG2_PUFFER_GROESSE 10
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#define PUFFER_GROESSE (1 << LOG2_PUFFER_GROESSE)
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static int audio_deskriptor; /* Deskriptor fuer das Audio-Device */
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/* tatsaechliche Puffer-Groesse */
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static int puffer_groesse;
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/* bis hier lokaler Teil */
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/***********************************************/
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/* ab hier globaler Teil */
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/* 2 Fragmente der Groesse PUFFER_GROESSE */
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int frag = 2 << 16 | LOG2_PUFFER_GROESSE;
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if (ioctl(audio_deskriptor, SNDCTL_DSP_SETFRAGMENT, &frag))
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static char *meldung[] = { "iMaze - Sound Error", "",
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"Can't set fragment size:", NULL, NULL };
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meldung[3] = fehler_text();
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uebler_fehler(meldung, NULL);
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/* Puffer-Groesse abfragen */
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if (ioctl(audio_deskriptor, SNDCTL_DSP_GETBLKSIZE, &puffer_groesse))
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static char *meldung[] = { "iMaze - Sound Error", "",
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"Can't check audio buffer size:", NULL, NULL };
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meldung[3] = fehler_text();
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uebler_fehler(meldung, NULL);
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/* Puffer zu gross? */
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if (puffer_groesse > PUFFER_GROESSE)
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puffer_groesse = PUFFER_GROESSE;
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int speed = SAMPLING_RATE;
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/* Abtastrate setzen */
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if (ioctl(audio_deskriptor, SNDCTL_DSP_SPEED, &speed))
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static char *meldung[] = { "iMaze - Sound Error", "",
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"Can't set audio sample rate:", NULL, NULL };
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meldung[3] = fehler_text();
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uebler_fehler(meldung, NULL);
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void audio_hw_start(void)
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deskriptor_nicht_blockieren(audio_deskriptor);
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void audio_hw_close(void)
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close(audio_deskriptor);
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int audio_hw_protect(void)
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return 0; /* don't care about state information */
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void audio_hw_unprotect(int state)
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int audio_hw_is_busy(void)
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return 0; /* always try to write */
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int audio_hw_is_multiwrite_allowed(void)
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return 0; /* never try to write more than once */
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/* buffer[length], buffer[length + 1], ... might be modified! */
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int audio_hw_write(unsigned char *buffer, int length)
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if (length < puffer_groesse)
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memset(buffer + length, 128, puffer_groesse - length);
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written = write(audio_deskriptor, buffer, puffer_groesse);
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if (written >= length)
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void audio_hw_hint_waiting(void)
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audio_select_descriptor(audio_deskriptor, audio_hw_ready_callback, 1);
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void audio_hw_hint_not_waiting(void)
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audio_select_descriptor(audio_deskriptor, (void (*)(void))NULL, 1);
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int audio_open(char ***meldung)
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static char *message[] = { "iMaze - Sound Error", "",
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static char text[80];
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if ((audio_deskriptor = open(DEV_AUDIO, O_WRONLY | O_NDELAY, 0)) >= 0)
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sprintf(text, "Can't open %s:", DEV_AUDIO);
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message[3] = fehler_text();
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return errno == EBUSY ? 2 : 0;
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int audio_hw_get_buffer_size(void)
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return puffer_groesse;
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int audio_hw_uses_ulaw(void)
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return 0; /* no, linear encoding used */
added
removed
source/voxware_audio.c
